Amscan Rock On Heavy Metal Themed Party Postcard Invitations with Seals Kit, Paper, 4" x 6" , Pack of 8 Our Rock On Invitations feature an electric guitar and grunge prints of stars, lightning bolts and a winged Jolly Rogers. Invitation measures 4 1/4" x 6 1/4" Available in packs of 8 Great for your Rock 'n Roll Theme Party